Sound mute doesn't work – Hexa 1010 :Fill Hexagon Blocks Review

I love the color, layout, different options but the sound effect mute doesn't work. I muted both music and the sound effect but sound keeps playing unless I put my phone on silence. Iphone 7 user. Plz fix the issue.
Review by KoGimpel on Hexa 1010 :Fill Hexagon Blocks.